Selective Benzylic and Allylic Alkylation of Protic Nucleophiles with Sulfonamides through Double Lewis Acid Catalyzed Cleavage of sp<sup>3</sup>Carbon-Nitrogen Bonds
作者:Cong-Rong Liu、Man-Bo Li、Cui-Feng Yang、Shi-Kai Tian
DOI:10.1002/chem.200801665
日期:2009.1.5
broad range of tosyl‐activated benzylic and allylic amines to give diversely functionalized products in good to excellent yields and with high regioselectivity. Furthermore, the cross‐coupling reaction of 1,3‐dicarbonyl compounds with benzylic propargylic amine derivatives has been successfully applied to the one‐step synthesis of polysubstituted furans and benzofurans.
质子亲核试剂的酸催化的苄基和烯丙基烷基化是用于碳的形成从根本上重要碳和碳杂原子键,并且它是被使用作为烷基化试剂为苄基和烯丙基胺衍生物一个巨大的挑战。在本文中,我们报道了质子碳和硫亲核试剂与磺酰胺通过在室温下通过双路易斯酸催化的sp 3碳-氮键裂解实现的高效苄基和烯丙基烷基化。在催化量的廉价ZnCl 2存在下-TMSCl(TMSCl:氯三甲基硅烷),1,3-二酮,β-酮酸酯,β-酮酰胺,丙二腈,芳族化合物,硫醇和硫代乙酸可与多种甲苯磺酰基活化的苄基和烯丙基胺结合使用功能多样的产品,产率高至优异,区域选择性高。此外,1,3-二羰基化合物与苄基炔丙基胺衍生物的交叉偶联反应已成功地用于多取代呋喃和苯并呋喃的一步合成中。